Oh, one other......
 
The Band.
 
And that is not pulling Straummy's leg.
 
 
 
He's too far away for that.

The one band I wanted to see was Led Zepplin.  They came to Philly on the night our school was holding graduation. My buddy and I were going to ditch the cap and gown thing, get wasted and go see Zep. Our mom's threw a fit and we went to get our diplomas.  Bummer dude.
 
I saw ZZ Top 3 times.  Taking Texas to the People,  Deguello, and Recycler.   Great shows every time.
 
Hate that I've never seen most of the better country acts,

Was always gutted that I never got to see Frank Zappa live. 
 
And probably Little Feat. One of the all time greatest live bands (with Lowell George) and I'll only ever hear a recording. 

Original Genesis
Stevie Ray Vaughn
Leeds era Who
 
I seem to care less every year and the list shrinks.

SteveStrummerUK
These are definites for me, I'd love to have seen them in their pomp:

• Thin Lizzy

+1 here the line up with Scott Gorham & Brian Robertson....

Ozzy with Randy
King Diamond on the Conspiracy tour
Priest on the Screaming tour
Queensryche when Geoff could still hit all the high notes
Iron Maiden on the Powerslave tour
Dio with Vivian Campbell
Van Halen on the Fair Warning tour
AC/DC on the Highway To Hell tour
Sabbath on the Mob Rules tour

Biggest regrets are the opportunities I blew off for stupid reasons.
 
I was living in Nebraska when the Beatles came to Omaha. Back then we attended a lot of "road shows", where you'd get 10 bands who'd each do 15-minute sets and admission was $2.00. When the Beatles came to town they charged the unheard-of price of $5.00 and there wasn't even an opening act. Five bucks in those days was a night out, including dinner, movie and gasoline. I said I'll catch them next year, after their popularity has waned and they'd come to their senses on ticket prices.
 
More recently, I skipped a chance to see Nightwish in Seattle - because it was raining. Because it was raining! In Seattle!

I hear ya Dave.... no one likes to go out in the rain.
 
And ticket prices.... I would have loved to see the Eagles live, and they did come around on tour often enough. However, everyone else was charging $40 for a show and the Eagles boxoffice prices were $250....  sorry Glen and crew, that's out of my price range. @ tix for $500 plus fees is more than I care to part with for a 1 to 2 hr show.
 
Back in the day......  Black Sabbath with Ozzie ( they had their first US album out) and 2 opening act bands, cost $3....   It don't get better than that..... figuratively speaking.

The Eagles never made my list because they were the band that started ridiculous prices for concerts. I remember it well as Guitarhacker describes. U2 was $20 as were most bands that came to Toronto. Then the Eagles show up and sell out venues at $100+. That was the beginning of the end of my concert attendance. Now, shows sell out in seconds and most of the seats go to re-sellers who jack the prices even more. I started buying concert DVD's and never looked back. $500 to see Taylor Swift?! I'd rather stick a fork in my eye.

Tin Machine ("nah, they'll be back")
Prince (when he played a small venue a few doors up from my house a week or two before he died.  thought "nah, he'll be back")
INXS with Hutchense ("nah, they'll be back")
Charlie Sexton (hasn't toured solo in 20 years?)
Japan
Neil Young
Peter Gabriel (just can't get tickets fast enough before they sell out)